Persia was never an Ottoman posession but Arabia was, or at least most of it was. I'm too lazy to look it up on my phone. Caliph was among the titles claimed by the Ottoman Sultan and his claim was taken seriously by almost all Sunnis, particularly after the dethronement of the Mughals.
They didn't consider it among their more important titles until quite late, preferrimg Qaysar-i-Rum or Emperor of the Romans, but their claim to the Caliphate was long standing.
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Persia was never an Ottoman posession but Arabia was, or at least most of it was. I'm too lazy to look it up on my phone. Caliph was among the titles claimed by the Ottoman Sultan and his claim was taken seriously by almost all Sunnis, particularly after the dethronement of the Mughals.
They didn't consider it among their more important titles until quite late, preferrimg Qaysar-i-Rum or Emperor of the Romans, but their claim to the Caliphate was long standing.